protected override DbExpression VisitAggregateFunctionExpression(DbAggregateFunctionExpression aggregateFunctionExpression)
{
var functionName = GetAggregateFunctionBody(aggregateFunctionExpression.AggregateFunctionExpressionType);
var functionSyntax = CreateDefaultFunctionSyntax(functionName, aggregateFunctionExpression.Arguments);
return functionSyntax;
}